Improvement in motors for sewing-machines



[97.] 2 Shees--Shee I.

DAVID H. SHRMAN.

,Improvement in Motor for Sewing Machines.

[97.1 2 shew-sheet 2. DAVD H. SHERMAN.

Improvement in Motor for Sewing Machines.

No. 118,650. Panama-Aug. 29, 1871.

bte.

PATENT @Enron DAVID H. SHERMAN, OF WAUKEGAN, ILLINOIS.

IMPROVEMENT IN MOTORS FOR SEWING-MACHINES.

Specification forming part of Letters Patent No. 118,650, dated August29, 1871.

To all whom it may concern:

Be it known that I, DAVID H. SHERMAN, of Vv'ankegan, in the county ofCook and State of Illinois, have invented a new and valuable Im proveinent in Sewing-Machine Motors; and I do hereby declare that the followingis a full, clear, and exact description of the construction andoperation of the same, reference being had to the annexed drawing makinga part of this specification, and to the letters and gures of referencemarked thereon.

Figure l of the drawing is a representation of a side elevation of myinvention. Fig. 2 is a vertical section of the same.

This invention has relation to sewing-machine motors; and consists inthe construction and novel arrangement of devices, as hereinafterdescribed, by means of which several sewing-inachines can be driven froma single driving-shaft and their speed easily regulated.

Referring to the drawing, A A' represent a pair of revolving conesjournaled Within a strong frame, B, which is secured to and depends fromthe under side of the machine-table.` The shafts of said cones arehorizontal and parallel with each other. Each shaft holds a belt-Wheel,C, from which motion is given to the sewing-machines by means of belts.The shaft of roller or cone A is furnished also with a belt-Wheel, C',by means of Which said cone receives motion iroin a main shaft and Wheelthrough the medium of a communicating-belt. Any number of cones may bedriven from the cone A by means of friction-wheels.

In the drawing, D represents a friction-Wheel arranged to operate theroller A', said wheel being actuated byroller A. This Wheel is swiveledto a transverse shaft, E, and may be shifted along it, in the mannerhereinafter described. rlhe shaft E is adapted to slide up and down uponvertical rods or standards F, in order to place the friction-roller inor out of contact with the concs. The ends of the shaft E rest on a pairof arms, G, Which diverges from the upper end of a lever-arm, H. Apedal, I, is attached to the lower end of arm H, and pivoted to thesides of a stirrup, J. By pressing down the pedal, the shaft E andfriction-Wheel I) are raised to release the latter from the cones. Apair of spira-l springs, K, on the standards F serves to place theroller in contact with the cones when the foot is taken from the pedal.

L designates a lever having a forked end, L', which embraces the rollerD. The shaft E passes through said forked end. This lever is pivoted toa stand, M, by means of a bent brace, N, and is designed for the purposeof shifting the position ofthe frictioirroller in order to regulate thespeed of the cone A'. The lever is retained in any desirable position bymeans of a rack, 0, supported by the stand M, and is held in contactWith said rack by a spiral spring, P, on the brace N.

The cone A may be the middle one of three, driving those on either side,While the latter may drive others, running, thereby, 'as manysewingmaohines as there are cones.

The friction-rollers should be made of or covered with India rubber, toincrease their power.

I clailn as my invention- 1. For communicating motion tosewing-inachines, the driving-cone A, adjustable frictionroller D, andcones A', substantially as specied.

2. The combination, with the cones A A', of the friction-roller D, leverL, spring H, and rack O, substantially as specified.

3. The combination, with the cones A A', of the bar F, springs K, arm H,pedal I, and. adjustable roller D, substantially as specified.

Intestimony that I claim the above I have hereunto subscribed my name inthe presence of two Witnesses. v

DAVID H. SHERMAN.

Witnesses:

HIEAM L. HUGUNIN, NATEAMEL SHERMAN.

